Californian tuners World Motorsports has tuned the SLS with a twin-turbo setup to make 850 horsepower at less than 4 lbs. of boost. They are also planning to offer camshaft, valvetrain, internal transmission upgrades and clutch options from next year after doing some research and development, but in the meantime, the RADO SLS has been tested with over 10 lbs of boost in LA and on Mexican highways for the high speed runs.